package com.lfk.api.config;


import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * <p>
 *  生成订单唯一序列号
 * </p>
 *
 * @author Cat凯
 * @since 2023-2-1
 */
@Component
public class RedisIdWorker {
    /**
     * 开始时间戳
     */
    private static final long BEGIN_TIMESTAMP=1640995200L;

    /**
     * 序列号位数
     */
    private static final int COUNT_BIYS=32;
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    public long nextId(String keyPrefix){
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond =now.toEpochSecond(ZoneOffset.UTC);
        long timestamp=nowSecond-BEGIN_TIMESTAMP;
        //2.生成序列号
        //2.1获取当前日期,精确到日
        String date=now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //2.自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        //3.拼接并返回
        return timestamp<<COUNT_BIYS|count;
    }

    public static void main(String[] args) {
        LocalDateTime time = LocalDateTime.of(2022,1,1,0,0,0);
        long second =time.toEpochSecond(ZoneOffset.UTC);
        LocalDateTime now = LocalDateTime.now();
        String date=now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        System.out.println(date);
    }
}
